Re: SIGSEGV while reading vm mail

[Robert Mecklenburg]

RMS> It's clear from where this crashed that what happened was
RMS> something had clobbered the free list of conses.  It could have
RMS> been clobbered way down the list.  If that happened, then later
RMS> on after the previons conses had been allocated, Emacs would
RMS> crash at the next call to Fcons.


KFS> I have seen a number of bug reports from you recently with
KFS> crashes in different parts of emacs.  It seems like you are
KFS> pretty much alone in getting these crashes, so I really wonder if
KFS> there is anything special with your setup, or are you just
KFS> particularly good at finding those bugs :-)

I do spend virtually all my time in emacs (of course, so do lots of
others).



KFS> Are you perhaps using some particular compiler version, library
KFS> versions, X server version, window manager, or something else
KFS> which is not commonly used?

Here are details of my setup:

Mandrake 10.0 final release

1001 oops:src$ uname -a
Linux oops.realmsys.com 2.6.3-4mdkenterprise #1 SMP Tue Mar 2 07:00:53 CET 2004 
i686 unknown unknown GNU/Linux
1

1002 oops:src$ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 10
model name      : AMD Athlon(tm) XP  3200+
stepping        : 0
cpu MHz         : 2191.363
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips        : 4341.76

KDE 3.2

1007 oops:trunk$ cat emacs-configure-options
./configure --with-x11 --with-x-toolkit=gtk

Here is the link line from my build:

gcc -nostdlib `./prefix-args -Xlinker  -R/usr/X11R6/lib -z nocombreloc` 
-Wl,-znocombreloc -L/usr/X11R6/lib -o temacs pre-crt0.o /usr/lib/crt1.o 
/usr/lib/crti.o dispnew.o frame.o scroll.o xdisp.o xmenu.o window.o charset.o 
coding.o category.o ccl.o cm.o term.o xfaces.o xterm.o xfns.o xselect.o xrdb.o 
fontset.o xsmfns.o fringe.o image.o gtkutil.o emacs.o keyboard.o macros.o 
keymap.o sysdep.o buffer.o filelock.o insdel.o marker.o minibuf.o fileio.o 
dired.o filemode.o cmds.o casetab.o casefiddle.o indent.o search.o regex.o 
undo.o alloc.o data.o doc.o editfns.o callint.o eval.o floatfns.o fns.o print.o 
lread.o abbrev.o syntax.o unexelf.o bytecode.o process.o callproc.o 
region-cache.o sound.o atimer.o doprnt.o strftime.o intervals.o textprop.o 
composite.o md5.o    terminfo.o lastfile.o   vm-limit.o   mktime.o    
-L/usr/X11R6/lib -Wl,--export-dynamic -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 
-lgdk_pixbuf-2.0 -lm -lpangoxft-1.0 -lpangox-1.0 -lpango-1.0 -lgobject-2.0 
-lgmodule-2.0 -ldl -lglib-2.0 -lSM -lICE -ltiff -ljpeg -lpng -lz -lm -lungif 
-lXpm -lX11  -lncurses   -lm -lgcc -lc -lgcc /usr/lib/crtn.o


1021 oops:trunk$ xrdb -symbols
-DHOST=oops.realmsys.com
-DSERVERHOST=oops.realmsys.com
-DSRVR_oops_realmsys_com
-DDISPLAY_NUM=0
-DCLIENTHOST=oops.realmsys.com
-DCLNT_oops_realmsys_com
-DVERSION=11
-DREVISION=0
-DVENDOR="Mandrake Linux (XFree86 4.3, patch level 30mdk)"
-DVNDR_Mandrake_Linux__XFree86_4_3__patch_level_30mdk_
-DRELEASE=40300001
-DNUM_SCREENS=1
-DEXT_RANDR
-DEXT_RENDER
-DEXT_XFree86_Bigfont
-DEXT_SECURITY
-DEXT_XC_APPGROUP
-DEXT_LBX
-DEXT_XKEYBOARD
-DEXT_XTEST
-DEXT_XInputExtension
-DEXT_MIT_SHM
-DEXT_X_Resource
-DEXT_XVideo
-DEXT_Extended_Visual_Information
-DEXT_TOG_CUP
-DEXT_FontCache
-DEXT_DPMS
-DEXT_XFree86_DGA
-DEXT_XFree86_Misc
-DEXT_XFree86_VidModeExtension
-DEXT_XC_MISC
-DEXT_MIT_SCREEN_SAVER
-DEXT_SYNC
-DEXT_BIG_REQUESTS
-DEXT_MIT_SUNDRY_NONSTANDARD
-DEXT_SHAPE
-DEXT_DOUBLE_BUFFER
-DSCREEN_NUM=0
-DWIDTH=1600
-DHEIGHT=1200
-DX_RESOLUTION=3704
-DY_RESOLUTION=3738
-DPLANES=24
-DBITS_PER_RGB=8
-DCLASS=TrueColor
-DCLASS_TrueColor=33
-DCOLOR
-DCLASS_TrueColor_24=33
-DCLASS_DirectColor_24=34



Extra emacs packages I run include:

bbdb-2.35
cc-mode-5.30
cedet-1.0beta2b
ecb-2.25
jde-2.3.4beta5
vm-7.18


As you may be able to tell, I'm not an expert at Linux/GTK/rpm.  What
more information would you like?



KFS> Are you sure you don't have faulty RAM in your system?

How can I be sure?  There are no symptoms of faulty RAM.  All other
programs run without problems.  If there is a Linux tool to test this,
I'm happy to run it.


I know you're busy folks and I'm well able to live with these
problems.  If these reports are a distraction, please let me know and
I'll stop sending them.


Thanks,
-- 
Robert